Re-Examination of the Conceptual Foundations of Quantum Acoustics: Interpretation and Verification Within a Classical Continuous Dynamics Framework

The theoretical construction of traditional quantum acoustics is based on the core presupposition that "microscopic structures must be described by quantum mechanics". This presupposition has not been directly verified, and its core concept, the "phonon", is defined as a quasi-particle with energy E=hν. This paper systematically reexamines the conceptual foundations of quantum acoustics based on the "Revised Energy Quantum Concept" – i.e., the "measurement discreteness" of energy transfer rather than "physical discreteness". Drawing on the radiation mechanism of an electron's variable-speed motion around the nucleus (which clearly distinguishes the orbital frequency from the radiation frequency), this paper further clarifies that the natural frequency of crystal lattice vibration (the frequency of atomic motion around equilibrium positions) and the energy radiation/absorption frequency are two independent physical quantities. They are connected through the "frequency change quantity". The interaction between high-frequency sound waves and the lattice is essentially a classical continuous dynamics process. "Phonons" are not particles with physical reality but are discrete measurement units for changes in the excitation strength of lattice vibration modes. Starting from first principles and based on the core mechanism of "frequency change triggering energy exchange", this paper rigorously derives the zero-point energy formula, pointing out that zero-point energy essentially characterizes the dynamic ground-state energy scale of a system under the constraint of the minimum energy measurement unit ε. Using Raman scattering as an example, quantitative calculations of energy transfer involving the revised energy quantum εare supplemented, clarifying the physical meaning differences between ε and h. The study shows that all quantum acoustics phenomena can be interpreted and verified more clearly and self-consistently within a classical continuous dynamics framework, providing a theoretically solid and physically intuitive path for the field.